Question

3. IF the mean of X, X+2, X+4. X+6, X+8 is 11.then the mean
of first three observation​

Answer 1

Step-by-step explanation:

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Answer 2

Answer:

Mean of first three observation = 9

Step-by-step explanation:

$Here, \frac{x + (x + 2) + (x + 4) + (x + 6) + (x + 8)}{5} = 11 \\ x + (x + 2) + (x + 4) + (x + 6) + (x + 8) = 55 \\ 5x + 20 = 55 \\ 5x = 35 \\ x = 7$

$Mean \: of \: first \: three \: observation \\ = \frac{7 + 9 + 11}{3} \\ = \frac{27}{3} \\ = 9$

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